2
-1
Section::::Abstract.
Planet
22915
2
-1
Section::::History.

Orbit
22498
2
-1
Section::::Abstract.
Sun
26751
2
-1
Section::::Abstract.
Earth
9228
two
-1
Section::::Abstract.
Planet
22915
two
-1
Section::::Planetary orbits.

Orbit
22498
two
-1
Section::::General characteristics.

Sun
26751
two
-1
Section::::Chronology.:Geological history.

Earth
9228